Jim, that's why the league tests switcher power supplies for trash.
All you have to do is read the reviews and buy a good one.
You always get trash when you buy cheap, no matter what it is!
73,
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of N4be_Jim
Sent: Saturday, September 08, 2012 4:03 AM
To: tentec@contesting.com
Subject: Re: [TenTec] TenTec Digest, Power Supplies
>
> I use only linear supplies where possible. I couldnt care less about
efficiency. Why? Ever listen to the trash a cheap switcher puts out on HF?
Unless well designed and filtered, a switching supply will raise the noise
floor several S units. Yes there are decent ones but i would rather not
worry about it. Yes TT makes decent switchers, such as for the Orion, but
ever hear one of those when the fan kicks in? In my area a great deal of HF
hash in generated by all the cheap Chinese supplies that dont adhere to our
EMI standards, but we still accept their imports. No I will take my Astron
50 amp 12 vdc supply any day. It runs my O2 and Harris RF-3200E quite
easily while loafing along. Jim N4BE
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